TY - JOUR ID - 14374 TI - Experimental Investigation of Submerged Flow over Porous Embankment Weirs with Up and Downstream Slopes JO - Irrigation Sciences and Engineering JA - JISE LA - en SN - 2588-5952 AU - Moradi, Mehrzad AU - Fathi-Moghadam, Manochehr AU - Davoudi, Leila AD - M.Sc Graduate, Department of Water Science Engineering, Shahid Chamran University of Ahvaz. AD - Professor, Department of Water Science Engineering, Shahid Chamran University of Ahvaz AD - Ph.D. Graduate, Department of Water Science Engineering, Shahid Chamran University of Ahvaz . Y1 - 2020 PY - 2020 VL - 43 IS - 2 SP - 187 EP - 199 KW - Porous embankment weir KW - submerged flow KW - Modular limit DO - 10.22055/jise.2018.20052.1432 N2 - Embankment weirs are finite crested weirs with various side slopes that can be used for different purposes such as flow measurement and diversion, water level management, aeration or water purification, etc. The hydraulic performance and the characteristics of flow over solid weirs with finite crest length in free and submerged flow conditions have been of interest to many studies (Azimi and David. 2013). Unlike the impermeable weirs, porous weirs contribute to the water purification in the rivers and channels downstream of the structures. Hence, they are structures with positive impact on water treatment. Sargison and Percy (2009) studied the performance of BC weirs with side slopes varying between vertical positions to 1V:2H. Results indicated that by decreasing the slope of upstream face, the discharge coefficient increases and the height of the upstream water surface reduces. Although the characteristics of flow over porous weirs have been studied until now, there are still remaining facts to discover about performance of these kinds of structures in practice. Hence, this study has benefited from extensive experimental data obtained by laboratory tests to develop formulas to estimate hydraulic parameters for discharge reduction factor in the submerged flow conditions. This study investigates the hydraulic performance of flow over the porous embankment (PE) weirs for both free and submerged flow conditions. To do this, the hydraulic behavior of flow over 16 different PE weir models was examined in a rectangular flume. Results showed that the effect of the upstream slope of weirs is negligible on the modular limit index while the downstream slopes of weirs did not affect the free flow parameters. Also, both up- and downstream side slopes have no significant effect on the characteristics of the submerged flow. UR - https://jise.scu.ac.ir/article_14374.html L1 - https://jise.scu.ac.ir/article_14374_f6319982b05f6ec6a9553b46bb3a7a70.pdf ER -